题目内容

New ideas have been put into practice ______ he was elected our leader.

A. for
B. after
C. since
D. hence

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Miranda lost weight ______ being on a diet.

A. by
B. with
C. to
D. from

条件致病菌的感染是

A. 外源性感染为主
B. 原为正常菌群，特定条件而感染
C. 与细菌寄生部位无关
D. 与机体免疫力无关
E. 易感人群为婴幼儿

I will get an exam tomorrow, so for ________ reasons I won't go out tonight.

A. direct
B. plain
C. unknown
D. obscure

DFA是

A. 直接免疫荧光
B. 间接免疫荧光
C. 放射免疫分析
D. 酶联免疫吸附试验
E. 免疫放射分析